121515040 has 48 divisors (see below), whose sum is σ = 296352000. Its totient is φ = 47036160.

The previous prime is 121515029. The next prime is 121515047. The reversal of 121515040 is 40515121.

It is a junction number, because it is equal to n+sod(n) for n = 121514999 and 121515017.

It is not an unprimeable number, because it can be changed into a prime (121515047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7290 + ... + 17209.

It is an arithmetic number, because the mean of its divisors is an integer number (6174000).

Almost surely, 2^121515040 is an apocalyptic number.

121515040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121515040 is an abundant number, since it is smaller than the sum of its proper divisors (174836960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121515040 is a wasteful number, since it uses less digits than its factorization.

121515040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24545 (or 24537 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 121515040 is about 11023.3860496673. The cubic root of 121515040 is about 495.3095231107.

The spelling of 121515040 in words is "one hundred twenty-one million, five hundred fifteen thousand, forty".